[gtkmm] Error with Glib:RefPtr<Gtk::TreeModel::Row>

[Bart Verstraete <bartverstraete telenet be>]

when I declare a Glib:RefPtr<Gtk::TreeModel::Row> (also with 
TreeModel::iterator) in a function I get this when I compile, whitout it 
, it compiles without a hitch(is this correct :-))

grts Bart

source='main.cc' object='main.o' libtool=no \
depfile='.deps/main.Po' tmpdepfile='.deps/main.TPo' \
depmode=gcc3 /bin/sh ../depcomp \
g++ -DHAVE_CONFIG_H -I. -I. -I.. -DXTHREADS -D_REENTRANT -DXUSE_MTSAFE_API -I/usr/include/gtkmm-2.4 -I/usr/lib/gtkmm-2.4/include -I/usr/include/glibmm-2.4 -I/usr/lib/glibmm-2.4/include -I/usr/include/gdkmm-2.4 -I/usr/lib/gdkmm-2.4/include -I/usr/include/pangomm-1.4 -I/usr/include/atkmm-1.6 -I/usr/include/gtk-2.0 -I/usr/include/sigc++-2.0 -I/usr/lib/sigc++-2.0/include -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/gtk-2.0/include -I/usr/X11R6/include -I/usr/include/pango-1.0 -I/usr/include/freetype2 -I/usr/include/freetype2/config -I/usr/include/atk-1.0     -Wall -g  -c -o main.o `test -f main.cc || echo './'`main.cc
source='main.cc' object='main.o' libtool=no \
depfile='.deps/main.Po' tmpdepfile='.deps/main.TPo' \
depmode=gcc3 /bin/sh ../depcomp \
g++ -DHAVE_CONFIG_H -I. -I. -I.. -DXTHREADS -D_REENTRANT -DXUSE_MTSAFE_API -I/usr/include/gtkmm-2.4 -I/usr/lib/gtkmm-2.4/include -I/usr/include/glibmm-2.4 -I/usr/lib/glibmm-2.4/include -I/usr/include/gdkmm-2.4 -I/usr/lib/gdkmm-2.4/include -I/usr/include/pangomm-1.4 -I/usr/include/atkmm-1.6 -I/usr/include/gtk-2.0 -I/usr/include/sigc++-2.0 -I/usr/lib/sigc++-2.0/include -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/lib/gtk-2.0/include -I/usr/X11R6/include -I/usr/include/pango-1.0 -I/usr/include/freetype2 -I/usr/include/freetype2/config -I/usr/include/atk-1.0     -Wall -g  -c -o main.o `test -f main.cc || echo './'`main.cc
In file included from wndMain.h:7,
                from main.cc:2:
/usr/include/glibmm-2.4/glibmm/refptr.h: In destructor `
  Glib::RefPtr<T_CppObject>::~RefPtr() [with T_CppObject = 
Gtk::TreeRow]':
dirView.h:98:   instantiated from here
/usr/include/glibmm-2.4/glibmm/refptr.h:169: error: `unreference' 
undeclared 
  (first use this function)
/usr/include/glibmm-2.4/glibmm/refptr.h:169: error: (Each undeclared 
identifier 
  is reported only once for each function it appears in.)
make: *** [main.o] Error 1